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Engineer Presentation. Efficiency - GAS. Clamshell Heat Exchanger 80% Efficient. Typical two furnace unit. 400 °F. 1700 °F. Typical two furnace unit. 70 °F. 120 °F. 20 °F. 80 % Efficient. 75% Efficient. Air Stratification - Typical Heat Exchanger. 10-15 °F Δ T. Heat Exchanger.

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Typical two furnace unit
Typical two furnace unit

400 °F

1700 °F

Typical two furnace unit1
Typical two furnace unit




80% Efficient


Air stratification typical heat exchanger
Air Stratification - Typical Heat Exchanger

10-15 °F ΔT

Heat Exchanger

Tubular heat exchanger 82 83 efficient

Tubular Heat Exchanger 82-83% Efficient

350 °F

1700 °F

Primary secondary

Primary Secondary

93% Efficient

91% Efficient

150 °F

1700 °F

Sizing series

Sizing - Series




86% Efficient

91% Efficient

Sizing parallel

600 MBH input

Sizing - Parallel

300 MBH input

91% Efficient

91% Efficient

Air stratification high efficiency
Air Stratification – High Efficiency

Heat Exchanger

??? °F ΔT

Heat Exchanger

Minimum turn down limitation

Single Stage VS Modulation

The minimum turn down must be set to ensure condensing in the secondary heat exchanger or both heat exchangers must be made out of stainless steel.

The Power Venter/Draft Inducer’s airflow directly affects the gas to air ratio at the burner. The ratio must be set to keep Air Free CO below 400 PPM.

Minimum Turn Down Limitation

Why hydronic
Why Hydronic?

  • Minimize footprint while maximizing efficiency.

  • Maximum efficiency at the widest range of ambient & design conditions.

  • Maximizing user comfort while minimizing operating cost.

  • VAV minimum CFM is now limited by the supply fan instead of heat exchanger.

  • No stratification issues.

  • “Green” unit/minimize emissions

Xcelon w integral condensing boiler

Xcelon w/ Integral Condensing Boiler

100 °F

90 °F

140 °F

1700 °F

Air stratification heating
Air Stratification - Heating

Hot Water Coil


  • 93% thermal efficiency per BTS2000. With a discharge air temperature set at 70 degrees, that efficiency increases to 98% efficient.

  • Fully modulating gas valves.

    • 10:1 turndown ratio

  • Closed Hydronic Loop requiring no water connections at the roof. Only connections are gas, electricity and ductwork.

    • 35% Glycol Mix protects the unit to -30°F

The maximum allowed co is 400 ppm co air free
The maximum allowed CO is 400 PPM CO (Air Free)

  • Variable speed power venter

  • High fire should be between 8.5-9.5% for CO2 and below the maximum 150 PPM for CO.

  • Low fire should be between 8.0-8.5% for CO2 and below the maximum 150 PPM for CO.

Clamshell static pressure
Clamshell - Static Pressure

  • A typical Clamshell Heat Exchanger can have a static pressure drop of 1.12” per furnace.

  • This can result in a total static pressure of over 3” through the furnace sections.

Xcelon hot water coil
Xcelon – Hot Water Coil

  • Regardless of the BTU input and CFM selected, the hot water coil was carefully selected to keep the air pressure drop below 0.5” of static.

  • This can result in a reduction in motor horse power by up to two sizes.

  • Further adding to the electrical savings, all units come with a VFD as standard.

Cooling coil bypass
Cooling Coil Bypass

Bypass Damper

  • In cooling mode the bypass damper is closed forcing the air through the cooling coil.

  • When not in cooling mode, the bypass damper opens to reduce the internal static pressure of the unit.

Cooling Coil

Heat recovery layout
Heat Recovery Layout

VFD & Transformer




This recovered waste heat increases the efficiency by 1+%


  • Integral condensate trap designed to drain in the event of a power failure.

  • Condensate Neutralizer as a factory installed optional accessory.

  • Optional Dedicated heat trace power supply for long condensate runs.

Controls overview
Controls - Overview

  • Call for heat is received.

  • Dampers open and prove.

  • Burners turn on.

  • After glycol mix reaches temperature, VFD slowly ramps up.

  • Glycol mix temperature is varied to maintain constant discharge temperature.

  • (Optional) if the unit is unable to maintain discharge temperature, it reduces the CFM until discharge temp is satisfied.

Controls boiler
Controls - Boiler

  • The PID loop looks at the Propylene Glycol mix temperature, the discharge air temperature and rate of change.

  • HRT Controls are configured to run the first burner to 50% fire then turn on the second burner.

  • True run time monitoring

Controls safeties
Controls - Safeties

  • Boiler – High Limit, Low Water Cutoff, Ignition Control Fault and Software Operator Limit

    • Per code, unit complies with CSD-1.

  • Air Side – VFD Temperature Status and Damper Prove


  • Designed with ease of service in mind.

    • Isolation valves for ease of boiler service

      • Boiler is on a track for ease of repair.

    • Service lights standard on all units.

    • Optional Convenience Outlet available.

    • Optional Clogged Filter Switch.

    • External Control Terminal Strip on exterior of unit for ease of Thermostat wiring.

Engineer presentation

Roof Cap

  • The roof cap of the outdoor unit is sloped to prevent standing water on top of the unit.

  • It should be noted that underneath the roof cap is that actual roof of the unit which is a same panel construction as the walls (with the same R-value)


  • Performance

    • Max Discharge 140 ⁰F, Max temperature rise 100 ⁰F.

    • 4,501 - 15,000 CFM

      • Able to handle 3” of external static pressure

    • 800 – 1,600 MBH

  • Initial offering

    • 4,501 to 10,000 CFM

    • 800 & 1,200 MBH